JPH02255778A - Colored lead - Google Patents

Abstract

PURPOSE:To obtain a colored lead having excellent strength and weather resistance, comprising a colored lead of uncalcined type having a fibrous material as an extender material and containing mullite as the fibrous material. CONSTITUTION:The aimed colored lead comprising a colored lead of uncalcined type having a fibrous material as at least part of an extender material and containing mullite (formula 3Al2O3.2SiO2) as the fibrous material.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a non-fired color core containing a fibrous material as at least a part of the extender.

(Conventional technology) Non-fired type colored cores are made by mixing coloring materials, binding materials, fillers, and other lubricants used as necessary, mixing them, forming them, and drying them as necessary. Manufactured.

This non-fired colored core allows for a wider selection of colorants than fired type cores that have a clay skeleton or a carbide carbon skeleton, and also has a unique writing feel because the binder is not heat-treated at high temperatures. are doing.

However, on the other hand, it tends to be inferior in strength to fired type cores, and therefore various studies have been made to strengthen it.

A typical example of this is the use of fibrous materials as the body material. Potassium titanate disclosed in Japanese Patent Publication No. 62-3189 can be said to be a representative example.

(Problem SM to be solved by the invention) Potassium titanate may be used only for the purpose of reinforcement, but the most important thing for color cores is color development. In this respect, the use of potassium titanate has the disadvantage that the color development of handwriting deteriorates over time. In particular, if colors with high brightness such as red or yellow are exposed to light, the color will change significantly from the original color when written or applied. This means that it has poor light resistance.

Therefore, one object of the present invention is to provide a color core that not only has excellent strength but also has excellent light resistance.

(Means for solving the problem) Mullite is used as the fibrous material. That is, the gist of the present invention is a non-fired color core containing a fibrous material as at least a part of one body material, and a color core containing mullite as the fibrous material.

The details will be explained below.

Mullite is an inorganic substance represented by the general formula 3AQ, 03.2SiO, and can be found in the form of short fibers with a diameter of about O,OLμm to 0.2μm and a length of about 0.5pm to 2.0μm, or long fibers. A variety of products are commercially available from various companies, including bulk types with sizes ranging from 10 m11 to 100 II l. By the way, the appearance color is white or close to it.

The manufacturing method is to use alumina, silica, boric acid, etc. as raw materials, melt them electrically, and make them into fibers by discharging them from a nozzle.
Also known is a method using a rotor that rotates at high speed.

Although it depends on the size of the core and the manufacturing method, it is preferable for boat fishing to use a core with a diameter of 1 μm or less and a length as long as possible. Further, the content in the core is preferably about 20 to 60%.

This mullite is blended with a binder, a coloring agent, and other materials used as necessary, kneaded, molded by injection or extrusion, and further dried as necessary to form a product. . Here, as materials other than mullite, polyvinyl alcohol 1. Polyvinyl acetal.

Carboxymethyl cellulose, nitrocellulose, polyethylene, polystyrene, epoxy resin, polyphenyl oxide, polyvinyl chloride, polyvinylidene chloride, etc., and as colorants, chromate-based yellow lead, chrome vermilion, ferrocyanide-based navy blue , sulfide-based cadmium yellow, cadmium red, oxide-based titanium oxide, red iron black, iron black, zinc white, sulfuric acid-based barium sulfate, lead sulfate, silicate-based ultramarine, calcium silicate, carbonate-based calcium carbonate. , magnesium carbonate, phosphate-based cobalt violet, carbonate-based carbon black,
Permanent red F5R, carmine 6, which is an azo pigment
I3. Lake Red C, Phthalocyanine Blue, Phthalocyanine Green, the product names are FZ series manufactured by Shinroihi, such as FZ-2007, FZ-304.
5S, FZ-3077, FZ-3147, FA series, e.g. FA-47, FA-205, NKP series manufactured by Nippon Fluorescence ■, e.g. NKP-7200, NKP-
8307, NKP-8515, NPI series, such as NPI-507, NPI-507C, and lubricants such as stearic acid, calcium stearate, alumina stearate, zinc stearate, etc.

In addition, waxes include paraffin wax, microcrystalline wax, montan wax, synthetic wax such as polyethylene wax, carnauba wax, cotton wax,
Natural waxes such as beeswax, higher fatty acid waxes such as undecylenic acid and behenic acid, etc., plasticizers such as propylene carbonate, dibutyl phthalate, dioctyl phthalate, etc., and other extenders such as talc, clay, calcium carbonate, etc. Examples include, and each can be used alone or in combination of two or more.

(Example) Production examples will be shown below. Note that "part" simply means 1 part by weight.

(Production Example 1) Mullite (average diameter approximately 0.01 μm, 20 parts average length approximately 0.5 μm) Polyvinyl chloride 25 parts Cadmium Yellow 15 parts Talc
30 parts Polyethylene wax 10 parts Stearic acid 5 parts Methyl ethyl ketone 100 parts The above compounded materials were kneaded with three rolls, and after adjusting the solvent content, extruded into a thin wire shape with an extruder.
After leaving it for one day, it was dried at 70℃.

It was cut into a predetermined length to obtain a yellow core with a diameter of about 211 Il.

Example 2 A red core was obtained in the same manner as in Example 1 except that cadmium yellow was changed to cadmium red in Production Example 1.

(ll construction example 3) Mullite (average diameter approx. 0.1 μm, 20 parts average length approx. 1
0 μm) Nitrocellulose 25 parts FZ-2005
(Coloring agent; mentioned above) 15 parts talc
30 parts Paraffin wax 15 parts Stearic acid 5 parts Methyl ethyl ketone 100 parts A yellow core was obtained in the same manner as in Production Example 1 except that the above compounded materials were used.

(Production Example 4) In Production Example 3, FZ-2005, (yellow fluorescent pigment)
A red core was obtained in the same manner as in Production Example 3 except that FZ-2003 (red fluorescent pigment; described above) was used.

(Production Examples 5 to 7) In Production Example 1, the amount of mullite used was changed from 20 parts to 3 parts.
A yellow core was obtained in the same manner as in Production Example 1 except that the amounts were changed to 0 parts, 40 parts, and 50 parts.

(Comparative Examples 1 to 7) Color cores were obtained in the same manner as in each production example except that potassium titanate was used instead of mullite.

(Comparative Example 8) A color core was obtained in the same manner as in Production Example 1 except that mullite was not used.

(Effects of the Invention) Table 1 shows the results of measuring the bending strength and light resistance of each side.

Table 1 (Note) Bending strength was measured according to JIS S 6005 (temperature 25°C, humidity 30%). In addition, light resistance is determined by writing on the area evenly on high-quality paper to avoid uneven coating (
After filling in a certain area (filling in the entire area), masking a part of it, and irradiating it with ultraviolet light for one hour using a fade tester, the difference in color between the irradiated area and the masked area is quantified, and the value is The smaller the value, the better the light resistance.

As can be seen from Table 1, the color core of the present invention has excellent strength and light resistance and is durable.

Claims (1)

[Claims] A non-fired color core containing a fibrous material as at least a part of an extender, the color core containing mullite as the fibrous material.